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Deblonde GJP, Morrison K, Mattocks JA, Cotruvo JA, Zavarin M, Kersting AB. Impact of a Biological Chelator, Lanmodulin, on Minor Actinide Aqueous Speciation and Transport in the Environment. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:20830-20843. [PMID: 37897703 DOI: 10.1021/acs.est.3c06033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/30/2023]
Abstract
Minor actinides are major contributors to the long-term radiotoxicity of nuclear fuels and other radioactive wastes. In this context, understanding their interactions with natural chelators and minerals is key to evaluating their transport behavior in the environment. The lanmodulin family of metalloproteins is produced by ubiquitous bacteria and Methylorubrum extorquens lanmodulin (LanM) was recently identified as one of nature's most selective chelators for trivalent f-elements. Herein, we investigated the behavior of neptunium, americium, and curium in the presence of LanM, carbonate ions, and common minerals (calcite, montmorillonite, quartz, and kaolinite). We show that LanM's aqueous complexes with Am(III) and Cm(III) remain stable in carbonate-bicarbonate solutions. Furthermore, the sorption of Am(III) to these minerals is strongly impacted by LanM, while Np(V) sorption is not. With calcite, even a submicromolar concentration of LanM leads to a significant reduction in the Am(III) distribution coefficient (Kd, from >104 to ∼102 mL/g at pH 8.5), rendering it even more mobile than Np(V). Thus, LanM-type chelators can potentially increase the mobility of trivalent actinides and lanthanide fission products under environmentally relevant conditions. Monitoring biological chelators, including metalloproteins, and their biogenerators should therefore be considered during the evaluation of radioactive waste repository sites and the risk assessment of contaminated sites.
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Affiliation(s)
- Gauthier J-P Deblonde
- Physical and Life Sciences Directorate, Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
- Glenn T. Seaborg Institute, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Keith Morrison
- Physical and Life Sciences Directorate, Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
- Glenn T. Seaborg Institute, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Joseph A Mattocks
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Joseph A Cotruvo
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Mavrik Zavarin
- Glenn T. Seaborg Institute, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Annie B Kersting
- Glenn T. Seaborg Institute, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
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Vasiliev AN, Banik NL, Marsac R, Kalmykov SN, Marquardt CM. Determination of complex formation constants of neptunium(V) with propionate and lactate in 0.5–2.6 m NaCl solutions at 22–60°C using a solvent extraction technique. RADIOCHIM ACTA 2019. [DOI: 10.1515/ract-2019-3107] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Natural clay rocks like Opalinus (OPA) and Callovo-Oxfordian (COx) clay rock are considered as potential host rocks for deep geological disposal of nuclear waste. However, small organic molecules such as propionate and lactate exist in clay rock pore water and might enhance Np mobility through a complexation process. Therefore, reliable complex formation data are required in the frame of the Safety Case for a nuclear waste repository. A solvent extraction technique was applied for the determination of
NpO
2
+
${\rm{NpO}}_2^ + $
complexation with propionate and lactate. Extraction was conducted from isoamyl alcohol solution containing 10−3 M TTA and 5 · 10−4 M 1,10-phenanthroline. Experiments were performed in 0.5–2.6 m NaCl solutions at temperatures ranging from 22 to 60 °C. Formation of 1:1 Np(V) complexes for propionate and lactate was found under the studied conditions. The SIT approach was applied to calculate equilibrium constants β°(T) at zero ionic strength from the experimental data. Log β°(T) is found linearly correlated to 1/T for propionate and lactate, evidencing that heat capacity change is near 0. Molal reaction enthalpy and entropy (
Δ
r
H
m
∘
${\Delta _{\rm{r}}}H_{\rm{m}}^ \circ $
and
Δ
r
S
m
∘
${\Delta _{\rm{r}}}S_{\rm{m}}^ \circ $
) could therefore be derived from the integrated van’t Hoff equation. Data for log β° (298.15 K) are in agreement with literature values for propionate and lactate. Np(V) speciation was calculated for concentrations of acetate, propionate and lactate measured in clay pore waters of COx. In addition, the two site protolysis non-electrostatic surface complexation and cation exchange (2SPNE SC/CE) model was applied to quantitatively describe the influence of Np(V) complexation on its uptake on Na-illite, a relevant clay mineral of OPA and COx.
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Affiliation(s)
- Aleksandr N. Vasiliev
- Karlsruher Institut für Technologie (KIT), Institut für Nukleare Entsorgung , P.O. Box 3640 , 76021 Karlsruhe , Germany
- Radiochemistry Division, Chemistry Department , Lomonosov Moscow State University , Moscow 119992 , Russia
- Institute for Nuclear Research, Russian Academy of Sciences , Moscow 117312 , Russia
| | - Nidhu L. Banik
- Karlsruher Institut für Technologie (KIT), Institut für Nukleare Entsorgung , P.O. Box 3640 , 76021 Karlsruhe , Germany
- JRC-KARLSRUHE, G.II.6 – Nuclear Safeguards and Forensics, European Commission , P.O. Box 2340 , D-76125 Karlsruhe , Germany
| | - Rémi Marsac
- Karlsruher Institut für Technologie (KIT), Institut für Nukleare Entsorgung , P.O. Box 3640 , 76021 Karlsruhe , Germany
- Univ Rennes, CNRS, Géosciences Rennes – UMR 6118 , F-35000 Rennes , France
| | - Stepan N. Kalmykov
- Radiochemistry Division, Chemistry Department , Lomonosov Moscow State University , Moscow 119992 , Russia
| | - Christian M. Marquardt
- Karlsruher Institut für Technologie (KIT), Institut für Nukleare Entsorgung , P.O. Box 3640 , 76021 Karlsruhe , Germany , Phone: +49 721 60825686
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Taube F, Drobot B, Rossberg A, Foerstendorf H, Acker M, Patzschke M, Trumm M, Taut S, Stumpf T. Thermodynamic and Structural Studies on the Ln(III)/An(III) Malate Complexation. Inorg Chem 2018; 58:368-381. [DOI: 10.1021/acs.inorgchem.8b02474] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Franziska Taube
- TU Dresden, Central Radionuclide Laboratory, 01062 Dresden, Germany
| | - Björn Drobot
- TU Dresden, Central Radionuclide Laboratory, 01062 Dresden, Germany
| | - André Rossberg
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, 01328 Dresden, Germany
| | - Harald Foerstendorf
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, 01328 Dresden, Germany
| | - Margret Acker
- TU Dresden, Central Radionuclide Laboratory, 01062 Dresden, Germany
| | - Michael Patzschke
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, 01328 Dresden, Germany
| | - Michael Trumm
- Karlsruher Institut für Technologie, Institut für Nukleare Entsorgung, 76021 Karlsruhe, Germany
| | - Steffen Taut
- TU Dresden, Central Radionuclide Laboratory, 01062 Dresden, Germany
| | - Thorsten Stumpf
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, 01328 Dresden, Germany
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Jordan N, Demnitz M, Lösch H, Starke S, Brendler V, Huittinen N. Complexation of Trivalent Lanthanides (Eu) and Actinides (Cm) with Aqueous Phosphates at Elevated Temperatures. Inorg Chem 2018; 57:7015-7024. [DOI: 10.1021/acs.inorgchem.8b00647] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- N. Jordan
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - M. Demnitz
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - H. Lösch
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - S. Starke
- Helmholtz-Zentrum Dresden - Rossendorf, Computational Science Group (FWCC), Department of Information Services and Computing (FWC), Bautzner Landstraße 400, 01328 Dresden, Germany
| | - V. Brendler
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - N. Huittinen
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
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Fröhlich DR, Trumm M, Skerencak-Frech A, Panak PJ. The Complexation of Cm(III) with Succinate Studied by Time-Resolved Laser Fluorescence Spectroscopy and Quantum Chemical Calculations. Inorg Chem 2016; 55:4504-11. [DOI: 10.1021/acs.inorgchem.6b00277] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Daniel R. Fröhlich
- Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
| | - Michael Trumm
- Karlsruher Institut für Technologie, Institut
für Nukleare Entsorgung, P.O. Box
3640, 76021 Karlsruhe, Germany
| | - Andrej Skerencak-Frech
- Karlsruher Institut für Technologie, Institut
für Nukleare Entsorgung, P.O. Box
3640, 76021 Karlsruhe, Germany
| | - Petra J. Panak
- Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
- Karlsruher Institut für Technologie, Institut
für Nukleare Entsorgung, P.O. Box
3640, 76021 Karlsruhe, Germany
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Vasiliev AN, Banik NL, Marsac R, Froehlich DR, Rothe J, Kalmykov SN, Marquardt CM. Np(v) complexation with propionate in 0.5-4 M NaCl solutions at 20-85 °C. Dalton Trans 2015; 44:3837-44. [PMID: 25611787 DOI: 10.1039/c4dt03688c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Low molecular weight organics (LMWO; e.g. acetate, propionate, lactate) can significantly impact the speciation and mobility of radionuclides in aqueous media. Natural clay rock formation, considered as a potential host rock for nuclear waste disposal, can contain a significant amount of organic matter. There are less thermodynamic data reported for the complexation of pentavalent actinides with LMWO, especially under elevated temperature conditions, relevant for assessing the long-term safety of disposal options for heat-producing high-level nuclear waste. In the present study, the complexation of Np(v) with propionate is studied using spectroscopic techniques in 0.5-4 M NaCl solutions by systematic variation of the ligand concentration and temperature. Slope analysis shows the formation of the 1 : 1 NpO2-propionate complex (NpO2Prop). The local structure of the NpO2-propionate complex is determined by extended X-ray absorption fine structure spectroscopy, the results of which suggest that propionate binds to Np(v) in a bidentate mode. Using the specific ion interaction theory (SIT), the stability constant at zero ionic strength and 25 °C is determined as log β°1,1 = 1.26 ± 0.03. The stability constants increase continuously with increasing temperature between 20 and 85 °C. The log β0 values are linearly correlated with the reciprocal temperature, indicating ΔrH = const. and ΔrC = 0, allowing the calculation of ΔrH and ΔrS for the formation of the NpO2-propionate complex using the integrated van't Hoff equation. The thermodynamic evaluation indicates that the reaction is endothermic and entropy driven.
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Affiliation(s)
- Aleksandr N Vasiliev
- Karlsruher Institut für Technologie (KIT), Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany.
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Skerencak-Frech A, Maiwald M, Trumm M, Froehlich DR, Panak PJ. The Complexation of Cm(III) with Oxalate in Aqueous Solution at T = 20–90 °C: A Combined TRLFS and Quantum Chemical Study. Inorg Chem 2015; 54:1860-8. [DOI: 10.1021/ic502749x] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrej Skerencak-Frech
- KIT−Campus Nord, Institut für Nukleare Entsorgung, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Martin Maiwald
- Ruprecht Karls Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany
| | - Michael Trumm
- KIT−Campus Nord, Institut für Nukleare Entsorgung, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Daniel R. Froehlich
- Ruprecht Karls Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany
| | - Petra J. Panak
- Ruprecht Karls Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany
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Fröhlich DR, Skerencak-Frech A, Panak PJ. A spectroscopic study on the formation of Cm(III) acetate complexes at elevated temperatures. Dalton Trans 2014; 43:3958-65. [PMID: 24448229 DOI: 10.1039/c3dt52989d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The complexation of Cm(III) with acetate is studied by time resolved laser fluorescence spectroscopy (TRLFS) as a function of ionic strength, ligand concentration, temperature and background electrolyte (NaClO4, NaCl and CaCl2 solution). The speciation of Cm(III) is determined by peak deconvolution of the emission spectra. To obtain the thermodynamic stability constants (log K) for the formation of [Cm(Ac)n](3-n) (n = 1-3), the experimental data are extrapolated to zero ionic strength according to the specific ion interaction theory (SIT). The results show a continuous increase of the stability constants with increasing temperature (20-90 °C). The standard reaction enthalpies and entropies (ΔrH, ΔrS) of the respective reactions are derived from the integrated Van't Hoff equation. The results show that all complexation steps are endothermic and thus entropy driven (ΔrH and ΔrS > 0).
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Affiliation(s)
- Daniel R Fröhlich
- Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany.
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Fröhlich DR, Skerencak-Frech A, Gast M, Panak PJ. Fulvic acid complexation of Eu(iii) and Cm(iii) at elevated temperatures studied by time-resolved laser fluorescence spectroscopy. Dalton Trans 2014; 43:15593-601. [DOI: 10.1039/c4dt02339k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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